Universal bench grinder



Patented Oct. 15, 1946 UNITED STATES PATENT #OFFICE UNIVERSAL BENCH GRINDER Anders Bernhard Blomquist,` Cranston,` R. I. Appiieaticn June 20, 1945, serial No; 600,521`

I y 6 Claims. ly d 'IIhis invention relates toa machine tool, particularly a machinewhich utilizes abrasive means for removing excessive material from a work plece. f

In making dies, gauges and like tools, it is often necessary after subjecting the tool to a hardening process to. manually remove, such as by honing or hand grinding, surplus material from, the tool at locations thereon not accessible to machine tools now in use.

It is an object of this invention to provide a machine toolv which will be adaptable for'more complete use in the removal of material from dies, gauges and like tools after subjecting the same toa hardening process.

Another object of the invention is the provision of a machine toolof the above character in which the cutting tool will be provided with a reciprocal motion.

Another object of the invention is the provision of a machine tool of the above character in which a rotating cutting tool will be additionally providcdwith a reciprocating motion.

Another object or the invention is the provi sion of a machine tool of the above character in which the cutting tool may be positioned to operate upwardly or downwardly upon the work.,

Another object of the invention is the provision of av machine tool of the above character in which the cutting tool support may be rotated through 360,

Another object of the invention is the provision of a machine tool of the above character in which the tool may be rotated and reciprocated by sources of power which are independent from each other,

Another object of the invention is Ythe provision of a machine of the above character in which a work support may be angularly positioned with respect to the cutting tool. Y

With these and other objects in view, the invention consists of certain novel features of construction, as will be more fully described and particularly pointed out in the appended claims.

In theaccompanying drawings:

Fig. 1 is a side elevation partly in section of a machine embodying my invention;

Fig. 2 is a front elevational view of the machine; Y

Fig. 3 is a side elevational view of the machine with the cutting tool and supporting structure positioned at a location opposite to that shown,

inIFigl; A

Fig; 4- isa view partly in section taken substantially, along line 4,4.of-,Fig, 3,;

2 Fig. 5 is a sectional view taken substantially alongi line 5.5 of Fig, 1;

Eig. 6 is a sectional view taken substantially along line 6 6 of Fig. 1*; and

liligL 7 is al sectional view taken substantially along line T-T of F ig3 In proceeding with this invention I rotatably" mount a cutting tool which may be a ,grinding` wheel` of a size Vand form appropriate to the nature or, the work to be operatedupon. The wheel isprovidedl with a reciprocal motionand is mounted in such` a manner` as to approach the work either from above or below orV at such an angle as may be founddesirable.

Referring to the drawings for a more detailed. description of the invention I designates a basefrom which there extends an upright or column lis` split andin which is receivedl the trunnion I3., The lwalls of this opening terminate in spaced.

ears provided with aligned openings I6 and I'I (see- Fig.` 5). The opening I1 is threaded and receives a screw bolt IBV which extends through opening'rIIS- to adjustably secure the support on v the bracket I=2.

-,ingwhich receives the end portion of a lever 29 which is rockable to reciprocaterthe motor in the VFrom the support `Ui thereextends in spaced substantial parallel relation arms I9, 2U, each `of which is provided at the outer end with a clamp portion12| in which there is provided an opening the, wall4 of` which extend into spaced ears.- and are pierced to receive clamp screws 22. A bearing sleeveV 2.3 is mounted within the openings ofl theclamps andl provides a bearing in` which a motor 24; is slidably mounted. This motor is provided with an outer sleeve 25 to which there are securedv spaced shoes 26, 2l', These shoes extend through an elongated opening 28 provided,

inthe outer sleeve 23 and provide a bearing.- open- 3l1 located in elongated slot 32 providedv inthearm I9; A nut :i3` engages the threaded portion 3i and secures the hanger `il); in adjustable posi-I The hanger 3f!` is 4also'- provided With an elongated slot 3l!` and receives;

tion along the slot 32,

atpivot stud 35 which is, adlustablii` scoured along.;

tion thereof.

the slot 34. The lever 29 is bifurcated at its end portion 36 providing arms 31, 38 and also has an elongated slot 39 which receives the stud 35 to pivotally mount the lever on the hanger 30. The arrangement provides for changing the position of the lever in a horizontal and in a vertical direction.

A cam 40 is positioned between the arms 31, 38 and engages the same to rock the lever about the stud 35 and thus reciprocate the motor 24 in the sleeve 23. This cam is fixed on one end of a shaft 4| which is journaled in the support I4. The other end of the shaft carries a pulley 42. A second shaft 43 is also journaled in the support I4 and carries a pulley 44 at one end thereof and a pulley 45 at the other end. Pulley 44 is aligned with pulley 42 and a belt 46 operatively connects the pulleys.

In order to provide motion for the cam 40 a motor 41 is mounted at the upper end of the column I I by means of abutments 48 on the motor at a position to engage the surface of an L-shaped bracket 49. The motor is secured to this bracket by means of screw bolts 50. A speed reducing mechanism I is attached to the motor 41. From this mechanism 5I, there depends a worm shaft 52 which is journaled in bearings 53, 54 (see Fig. 7,) secured to the upper and lower plates 55, 56 which are fixed to the column in any appropriate manner such as by frictional engagement with the inner walls of the column Il. This worm shaft 52 engages a worm gear 51 fixed on a shaft 58. The shaft 58 extends substantially concentric with the axis of the trunnion I 3 and is journaled in bearing bushings 59 and 66. 'A collar 6I surrounds the shaft and engages the end of bushing 59. The worm gear 51 abuts against the end of bushing 60 thus preventing axial movement of the shaft in its bearings. The shaft 58 extends beyond the support i4 and mounts a pulley 6I which is aligned with pulley 45. An endless belt 62 operatively connects these pulleys 45 and IBI. Thus, motion is transmitted from the motor 41 to the cam 4B through the speed reducing mechanism 5I, worm 52, worm gear 51, shaft 58, pulleys 6I, 45, shaft 43, pulleys 44, 42 and shaft 4I.

A work supporting table 62 is swivelly mounted on the column I I by means of a bracket 63 which is adjustably slidable and secured in position on the column by bolts 64. The bracket is provided with an arm 65 positioned at one side of the center of the table and has an upwardly extending portion 56 which is received between ears 61, 68 depending from the table 62 from an edge por- The table 62 is pivotally mounted with relation to the portion 66 by means of a pivot pin 69 extending through portion 66 and through the ears 61, 68. The ear 61 is provided with an arcuate slot through which there extends a lock bolt 1| threadedly engaging opening 12 in the portion 66. The lower portion of the ear 61 may be provided with graduations 13 and the portion 66 with a datum line 13' so as to indicate the position of the surface of the table relative to the vertical.

The table may be raised or lowered by means of a threaded member 14 provided with an enlarged head 15 and fixed against longitudinal movement along the arm in a manner to permit rotation thereof as at 16. A collar 'I1 is swivelly mounted on the column II and has a threaded opening 'I8 through which extends the threaded member 14. A clamp collar 19 is adjustably mounted on the column II and provides an abutment against which the collar 11 rests. A central opening is provided in the table to receive the abrasive wheel 8l enabling it to move beyond the surface of the table when the wheel reciprocates. The wheel 8l is secured to the spindle of motor 24 by means of a chuck 82 and may be of a size and shape which is appropriate for the nature and character of the work to be handled.

In the operation of the machine the motors are set in motion, the motor 24 rotating the abrasive wheel 8I and the motor 41 reciprocating the abrasive wheel 8| in a manner above described. The work rests upon the surface of the table 62 which has been adjusted to the desired position. The work is then manually moved to the abrasive wheel and' manipulated in an appropriate manner so as to remove such material as is desired from the work. When it is desired to change the location of the grinding head from a position above the table 62, as shown in Fig. 1, to a position beneath the table, as shown in Fig. 3, the bolts 54 are loosened and the table swiveled about the column Il to a position which is out of the path of travel of the grinding head, the collar 11 moving with the bracket 63 because of its connections and the support I4 is free to be moved about trunnnion I3. The table 62 is next raised to clear the abrasive wheel 8|, then swung about the column to align opening 80 with the axis of the tool 8| and permit passing of the table thereover. To place the grinding head in the position shown in Fig. 1 it is merely necessary to reverse the operation above described.

It will now be apparent that I have provided a machine in which the abrasive tool supporting head may be swung through 360 to position the same at a location which is appropriate to the character of operation to be accomplished. It will also be apparent that the motor 24 may remain idle and the abrasive wheel 8l exchanged for such abrasive member which is operated by the reciprocation thereof. The speed of reciprocation may be chosen by the exchange of driving pulleys.

I claim:

l. A machine tool having a grinding head mounted for movement through an arc greater than 180, a motor slidably mounted in Said head, means for attaching an abrasive wheel to the spindle of said motor, e, rockably mounted lever engaging said motor, and a cam engaging said lever for reciprocating said motor.

2. A machine tool having a base, a bearing carried by said base and extending in a horizontal direction, a grinding head rotatably mounted by saidbearing for rotation in a vertical plane, an abrasive wheel carried by said head, and means for reciprocating said wheel including a pulley mounted for rotation about the axis of said bearing.

3. A machine tool having a work support, a grinding head mounted for rotative movement about a horizontal axis relative to said support through an arc greater than 180 and movable to position said grinding head from a location above said support to a position beneath said support.

4. A machine tool having a base, an upright extending from said base, a trunnion carried by said upright at substantially right angles thereto, a grinding head rotatably mounted on said trunnion for movement through an arc greater than 180, a motor slidably mounted insaid head, means for attaching an abrasive wheel to the spindle of said motor, a work support movable mounted on said upright at a location to be positioned beneath said trunnion, said grinding head being movable to be positioned from a location above said support lto a position atv a location beneath said support, said support having an opening through which said abrasive Wheel may extend when positioned beneath said support.

5. .A machine tool having a base, an upright extending from said base, a trunnion carried by said upright at substantially right angles thereto, a, grinding head rotatably mounted on said trun- -nion for movement through an arc greater than 6 above or beneath said support, said support having an opening through which said abrasive wheel may extend when positioned beneath said support. 6. A machine tool having a base, an upright extending from said base, a trunnion carried by Said upright at substantially right angles thereto, a grinding head rotatably mounted on said trunnion for movement through an arc greater than 180, a motor slidably mounted in said head, means for attaching an abrasive Wheel to the spindle of said motor, a work support movably mounted on said upright at a location to be positioned beneath said trunnion, said grinding head being movable to be'positioned from a location above said support to a position at a location i beneath said support, said support having an grinding head being movable to be positioned 20 from a location above said support to a position at a location beneath said support, said support being movable out of the path of movement oi said grinding head when moved from a location opening through which said abrasive Wheel may extend when positioned beneath said support, a lever rockably mounted in said grinding head and engaging said motor, a carn carried by said head and engaging said lever for rocking the same for reciprocating said motor.

ANDERS BERNHARD BLOMQUIST. 

